u.s. officials believe the suspects train in camps in libya. the libya attack killed four americans, killing chris stevens. meantime, a moving tribute in the nation's capital for the late amsterdam. >> reporter: u.s. amsterdam chris stevens along with three other americans were killed in an attack in benghazi, libya, september 11. friends and colleagues, secretary of state hillary clinton says his legacy will live on. >> he was an inspiration to all who knew him during his life. he remains an inspiration now and i believe far into the future. >> reporter: nearly two months since the attack, officials are looking into the incident and working to improve safety protocols. >> we now have a formal accountability review board investigating the attack that killed chris and we will apply its recommendations and lessons learned to improving security everywhere. >> reporter: his sister earned a standing ovation as she accepted his award on his behalf. she also revealed some personal details about her brother. >> his enaging personality, how many of my g